Specifies the operation.

If

transa

=

'N'

or

'n'

, then

y

:=

alpha

*

A

*

x

+

beta

*

y

If

transa

=

'T'

or

't'

or

'C'

or

'c'

, then

y

:=

alpha

*

A

T

*

x

+

beta

*

y

,

Number of rows of the matrix

A

.

Number of columns of the matrix

A

.

Specifies the scalar

alpha

.

Array of six elements, specifies properties of the matrix used for operation. Only first four array elements are used, their possible values are given in

Table “Possible Values of the Parameter

matdescra

(

descra

)”

. Possible combinations of element values of this parameter are given in

Table “Possible Combinations of Element Values of the Parameter

matdescra

”

.

Array containing non-zero elements of the matrix

A

.

Its length is

pntre

[m-1] -

pntrb

[0]

.

Refer to

values

array description in CSR Format for more details.

For one-based indexing, array containing the column indices plus one for each non-zero element of the matrix

A

. For zero-based indexing, array containing the column indices for each non-zero element of the matrix

A

.

Its length is equal to length of the

val

array.

Refer to

columns

array description in CSR Format for more details.

Array of length

m

.

This array contains row indices, such that

pntrb

[

i

] -

pntrb

[0]

is the first index of row

i

in the arrays

val

and

indx

.

Refer to

pointerb

array description in CSR Format for more details.

Array of length

m

.

This array contains row indices, such that

pntre

[

i

] -

pntrb

[0]-1

is the last index of row

i

in the arrays

val

and

indx

.

Refer to

pointerE

array description in CSR Format for more details.

Array, size at least

k

if

transa

=

'N'

or

'n'

and at least

m

otherwise. On entry, the array

x

must contain the vector

x

.

Specifies the scalar

beta

.

Array, size at least

m

if

transa

=

'N'

or

'n'

and at least

k

otherwise. On entry, the array

y

must contain the vector

y

.

Overwritten by the updated vector

y

.